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NEET2009PhysicsWaves and SoundActual

A sound absorber attenuates the sound level by 20 dB . The intensity decreases by a factor of

Options

  1. A1000
  2. B10000
  3. C10
  4. D100

Correct answer

D. 100

Step-by-step solution

Let intensity of sound be I and I^ Loudness of sound initially ₁=10 ( I I₀ ) Later, ₂=10 ( I^ I₀ ) Given, ₂- ₁=20 20=10 ( I^ I ) I^ =100 I

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